The algal biotechnology together with the wastewater treatment can contribute to the production of renewable energies such as bioethanol, biodiesel and biohydrogen and solve many of the challenges currently facing the shortage of fossil fuels and environmental impacts. Hydrogen as the cleanest source of energy is a promising alternative to conventional fossil fuels. Among different technologies for hydrogen production, photosynthetic microorganism, such as microalgae, has a great potential to produce hydrogen, by using only water and sunlight. One of the great opportunities is that microalgae can be cultivated in urban wastewater, which contains sources of carbon and nutrients, helping to reduce the cost of biomass and energy production. Microalgae C. vulgaris and S. obliquus immobilized grown in urban wastewater was proposed for the production of biohydrogen by sulfur deprivation and two light quality prior to anaerobic condition at pH 7.5 and 30 °C and 140 µE/m²/s of light intensity. The results indicate that blue light induces greater algal growth than under Purple light, while the maximum hydrogen production was for cultures under purple light of 128 mL H₂/L (productivity 204.8 mL H₂/L/day) and 60.4 mL H₂/L (productivity 39.18 mL H₂/L/day) for S. obliquus and C. vulgaris, respectively. An additional advantage is the high removal of organic carbon by S. obliquus cultures under purple incident light compared to C. vulgaris, being a double benefit; energy production and wastewater treatment.

藻类生物技术与废水处理可以促进可再生能源的生产，例如生物乙醇，生物柴油和生物氢，并解决了目前化石燃料短缺和环境影响所面临的许多挑战。氢作为最清洁的能源是常规化石燃料的有前途的替代品。在各种制氢技术中，光合微生物（例如微藻）仅通过使用水和阳光就能产生氢气。最大的机会之一是可以在城市废水中种植微藻，其中的废水中含有碳和养分，有助于降低生物质和能源生产的成本。微藻小球藻和斜生链球菌提出了在城市污水中固定化生长的方法，以通过脱硫和在pH 7.5和30°C的厌氧条件下以光强度140 µE / m ² / s产生两种光质量来生产生物氢。结果表明，与紫色光相比，蓝色光诱导藻类生长更大，而紫色光下的最大产氢量为128 mL H ₂ / L（生产力204.8 mL H ₂ / L /天）和60.4 mL H ₂ / L（斜生链球菌和寻常梭状芽孢杆菌的生产力分别为L（生产率39.18 mL H ₂ / L /天）。另一个优势是斜生链霉菌可高度去除有机碳在紫色入射光下进行培养，比普通梭状芽孢杆菌具有双重优势；能源生产和废水处理。